结构体指针数组构建图书馆
本帖最后由 AliceJames 于 2021-4-10 15:04 编辑目标：创建一个结构体指针数组作为图书馆，让用户可以录入书籍信息并且选择任意一本书打印其信息
我用一个数组来存放结构体，可以正常运行{:10_298:} #include <stdio.h>
#include <stdlib.h>
struct Date
{
int year;
int month;
int day;
};
struct Book
{
char title;
char author;
float price;
struct Date date;
char publisher;
};
void getInput(struct Book *);
void printBook(struct Book *);
//录入一本书的书籍信息
void getInput(struct Book *book)
{
printf("title: ");
scanf("%s", book->title);
printf("author: ");
scanf("%s", book->author);
printf("price: ");
scanf("%f", &book->price);
printf("date: ");
scanf("%d-%d-%d", &book->date.year, &book->date.month, &book->date.day);
printf("publisher: ");
scanf("%s", book->publisher);
}
//打印一本书的书籍信息
void printBook(struct Book *book)
{
printf("title: %s\n", book->title);
printf("author: %s\n", book->author);
printf("price: %.2f\n", book->price);
printf("date: %u\n", book->date.year, book->date.month, book->date.day);
printf("publisher: %s\n", book->publisher);
}
int main(void)
{
int count = 1, zhiling, temp, i;
struct Book *b = NULL;//将b定义为结构体指针
b = (struct Book *)malloc(sizeof(struct Book));
if(b == NULL)
{
printf("Failed!\n");
exit(1);
}
//先录入第一本书
printf("Write the first book!\n");
getInput(&b);
do
{
//让用户输入指令
printf("Enter an integer:(1 write a book/ 2 seek a book/ 0 leave): ");
scanf("%d", &zhiling);
switch(zhiling)
{
case 0:{
free(b);
printf("Thanks for use!\n");
return 0;
}break;
case 1:{
count++;
b = (struct Book *)realloc(b, count * sizeof(struct Book));//希望通过用户输入来改变数组大小，而不是由用户输入一个值来确定数组元素个数
if(b == NULL)
{
printf("Failed!\n");
exit(1);
}
printf("This is No.%d book!\n", count);
getInput(&b);
}break;
case 2:{
//打印已录入书籍的书名，以供用户选择查看哪本书
for(i = 0; i < count; i++)
{
printf("No.%d book: %s\n", i + 1, b.title);
}
printf("Which one do you want?");
scanf("%d", &temp);
printBook(&b);
}break;
}
putchar('\n');
}while(1);
return 0;
}
将数组元素换成结构体指针，在调用getInput函数时出现段错误（Segmentation fault)。。。请问如何解决？{:9_234:} #include <stdio.h>
#include <stdlib.h>
struct Date
{
int year;
int month;
int day;
};
struct Book
{
char title;
char author;
float price;
struct Date date;
char publisher;
};
void getInput(struct Book *);
void printBook(struct Book *);
void getInput(struct Book *book)
{
printf("title: ");
scanf("%s", book->title);
printf("author: ");
scanf("%s", book->author);
printf("price: ");
scanf("%f", &book->price);
printf("date: ");
scanf("%d-%d-%d", &book->date.year, &book->date.month, &book->date.day);
printf("publisher: ");
scanf("%s", book->publisher);
}
void printBook(struct Book *book)
{
printf("title: %s\n", book->title);
printf("author: %s\n", book->author);
printf("price: %.2f\n", book->price);
printf("date: %u\n", book->date.year, book->date.month, book->date.day);
printf("publisher: %s\n", book->publisher);
}
int main(void)
{
int count = 1, zhiling, temp, i;
struct Book **b = NULL;//将b定义为指向结构体指针数组的指针
b = (struct Book **)malloc(sizeof(struct Book *));
if(b == NULL)
{
printf("Failed!\n");
exit(1);
}
printf("Write the first book!\n");
getInput(b);
do
{
printf("Enter an integer:(1 write a book/ 2 seek a book/ 0 leave): ");
scanf("%d", &zhiling);
switch(zhiling)
{
case 0:{
free(b);
printf("Thanks for use!\n");
return 0;
}break;
case 1:{
count++;
b = (struct Book **)realloc(b, count * sizeof(struct Book *));//希望通过用户输入来改变数组大小，而不是由用户输入一个值来确定数组元素个数
if(b == NULL)
{
printf("Failed!\n");
exit(1);
}
printf("This is No.%d book!\n", count);
getInput(b);
}break;
case 2:{
//打印已录入书籍的书名，以供用户选择查看哪本书
for(i = 0; i < count; i++)
{
printf("No.%d book: %s\n", i + 1, b->title);
}
printf("Which one do you want?");
scanf("%d", &temp);
printBook(b);
}break;
}
putchar('\n');
}while(1);
return 0;
} void getInput(struct Book *);
void printBook(struct Book *);
换成
void getInput(struct Book **);
void printBook(struct Book **);
试试看 chxchxkkk 发表于 2021-4-11 00:28
void getInput(struct Book *);
void printBook(struct Book *);
换成
改了之后还是段错误{:9_221:}
是我改的不对吗{:9_222:}#include <stdio.h>
#include <stdlib.h>
struct Date
{
int year;
int month;
int day;
};
struct Book
{
char title;
char author;
float price;
struct Date date;
char publisher;
};
void getInput(struct Book **);
void printBook(struct Book **);
void getInput(struct Book **book)//改
{
printf("title: ");
scanf("%s", (*book)->title);
printf("author: ");
scanf("%s", (*book)->author);
printf("price: ");
scanf("%f", &(*book)->price);
printf("date: ");
scanf("%d-%d-%d", &(*book)->date.year, &(*book)->date.month, &(*book)->date.day);
printf("publisher: ");
scanf("%s", (*book)->publisher);
}
void printBook(struct Book **book)//改
{
printf("title: %s\n", (*book)->title);
printf("author: %s\n", (*book)->author);
printf("price: %.2f\n", (*book)->price);
printf("date: %u\n", (*book)->date.year, (*book)->date.month, (*book)->date.day);
printf("publisher: %s\n", (*book)->publisher);
}
int main(void)
{
int count = 1, zhiling, temp, i;
struct Book **b = NULL;//将b定义为指向结构体指针数组的指针
b = (struct Book **)malloc(sizeof(struct Book *));
if(b == NULL)
{
printf("Failed!\n");
exit(1);
}
printf("Write the first book!\n");
getInput(&b);//改
do
{
printf("Enter an integer:(1 write a book/ 2 seek a book/ 0 leave): ");
scanf("%d", &zhiling);
switch(zhiling)
{
case 0:{
free(b);
printf("Thanks for use!\n");
return 0;
}break;
case 1:{
count++;
b = (struct Book **)realloc(b, count * sizeof(struct Book *));//希望通过用户输入来改变数组大小，而不是由用户输入一个值来确定数组元素个数
if(b == NULL)
{
printf("Failed!\n");
exit(1);
}
printf("This is No.%d book!\n", count);
getInput(&b);//改
}break;
case 2:{
//打印已录入书籍的书名，以供用户选择查看哪本书
for(i = 0; i < count; i++)
{
printf("No.%d book: %s\n", i + 1, b->title);
}
printf("Which one do you want?");
scanf("%d", &temp);
printBook(&b);//改
}break;
}
putchar('\n');
}while(1);
return 0;
} 你全程没有给结构体指针赋相应的结构体空间，肯定会出现段错误啊
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